Produce warning if chart uses .Capabilities.APIVersions #6
Description
Produce warning if chart uses .Capabilities.APIVersions, which could affect rendered manifests, causing diff to not paint the full picture.
For example, Argo Workflows) won't render a ServiceMonitor resource, unless the API monitoring.coreos.com/v1 is being served.
This could be done by building on #4, that pulls and untars certain chart types. If to this for all charts (then template the local files), we can run grep to determine if a warning should be produced:
grep -R --include='*.yaml' --include='*.yml' --include='*.tpl' ".Capabilities.APIVersions"